/* 通用样式, 下例 demo 单独使用都需要这块样式 */
.banner-user{
    height: 300px;
  }
  .banner-user-elem{
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
  }
  .banner-user-elem .banner-user-title{
    font-size: 32px;
    top: 40%;
  }
  .banner-user-elem .banner-user-text{
    top: 40%;
  }
  .banner-anim-elem .bg{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    overflow: hidden;
}